Clip-on fan



FIG. 1 is a front perspective view of a clip-on fan showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left view thereof;

FIG. 5 is a right view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a rear perspective view thereof.

The broken lines illustrate portions of the clip-on fan which form no part of the claimed design. 

The ornamental design for a clip-on fan, as shown and described. 